Bobbin with die cast center core



Feb. 20, 1951 w, MILLER 2,542,554

BOBBIN WITH DIE CAST CENTER CORE Filed April 19, 1949 INVENTOR. WH-MfLLER @m.,a/W+?zzw7 A TTORN E75.

Patented Feb. 20, 1951 BOBBIN' WITH. DIE CAST CENTER CORE William. H- Miller, Hazelton, Pa.,

Glovcrleaf-Freeland Corporation,

assignor to Honesdale and Hazelton, Pa., a corporation of Pennsylvania Application April 19, 1949, Serial N 0. 88,468

1 Claim.

I1- I This invention. pertains to bobbins and spools but. more particularly to a. bobbin or spool having a die cast center core which can be. metallic in nature or composed of a suitable plastic.

Spools and bobbins of the present sort are used extensively in the textile industry but the invention is not to be limited to any particular use as it is applicable to spools or bobbins irrespective of the particular use to which they are to be put. .Bobbins can be used on tapered or straight spindles. The drawings herewith illustrate a bobbin construction for use with a tapered spindle but the inventive concept is applicable to bobbins constructed for use on straight spindles as the modification necessary to make the bobbin suitable for use on a straight spindle is well within I the capabilities of a skilled mechanic and would not require inventive genius.

The primary object of the invention is the provision of a new and improved bobbin and particularly one which because of its simplicity of construction and assembly can be manufactured and sold cheaply.

I, Another object of the invention is the provision of a bobbin having a cast center core.

A still further object of the invention is the provision. of a bobbin having a core and adaptor constructed in a manner whereby the over-all .length of the core or adaptor can be cheaply "and simply reduced so that the core and adaptor can be used in the production of bobbins of various traverse lengths. A still further object of the invention is the provision of a bobbin which in its assembled form is held together by the core in combination with an insert or adaptor.

Another and still further object of the invention is the provision of a, bobbin which even at high speeds is true-running and balanced.

Other objects, advantages, and novel features of construction of the invention will appear from the following description when read in the light of the accompanying drawings.

In the drawings:

Fig. 1 is a longitudinal sectional view through a bobbin embodying the present invention.

Fig. 2 is a transverse section on the line 2-2 of Fig. 1.

Fig. 3 is an end view of the lower end of the bobbin which is that end appearing at the righthand corner of Fig. 1 of the drawings.

Fig. 4 is a fragmentary sectional view illustrating a modification of the invention.

Described in broad terms the bobbin comprises a lower head A and an upper head B between which extends the bobbin barrel C which is a hollow open-ended tubular member usually and preferably composed of metal or plastic. The core comprises an elongated hollow tubular member D provided at its lower end with a circular shaped base E. An insert or adaptor is utilized in combination with the opposite or upper end of the core and comprises a circular plate-like portion F having at its inner side a short hollow tubular extension G. A. tapered spool driving spindle H extends through the core base E, its tubular portion D, and through the tubular portion G and plate-like portion F of the insert or adaptor. It has been conventional to make bobbns of wood and in many instances the barrels of the bobbins were bored for the reception of the spindle. It is difiicult to bore and ream wood for true running or turning as wood changes dimensionally in response to the moisture and high humidity which is ordinarily present in the mills where the bobbins are used. Because of the variable nature of wood it is extremely costly to balance wooden bobbins and difiicult. if not impossible to maintain them in balance.

In the present bobbin, metal or plastic is utilized and because of the even density of these materials it is practical to provide a balanced bobbin and to do so without great cost. Time, labor and cost are reduced by casting the bobbin core of metal or plastic.

The core base E is specifically constructed to provide at its outer or lowermost end a peripherally extending flange l. The remaining portion 2 of the base is circular in cross sectional configuration and of similar diameter to the interior diameter of the barrel 0 so that the end of the barrel C telescopically receives the core base portion 2 as is clearly illustrated in Fig. 1. The lower spool head A is provided centrally with a shouldered opening 3 for the reception of the core base flange I. At its opposite side adjacent its opening the head is provided with a circumferential shoulder 4 for the reception of one end of the barrel. As clearly appears in Fig. 1 of the drawing the barrel end lies between the outer face of the core base portion 2 and the shoulder i of the head.

The hollow elongated tubular portion D ofv the core is provided internally with a tapered bore 5 which extends throughout its length. The upper portion 5 of the tubular member D has a straight outer face by which is meant that the face is not tapered longitudinally. In the casting of the core this thickened portion 6 is of the same diameter throughout its length. To

' the core base.

be immediately apparent.

prepare the core for assembly the end of the portion 6 is for a considerable distance machined down to a reduced diameter as at T. This machined portion is for a portion of it length provided externally with threads 8 which stop short of the end of the member to provide an end portion 9 devoid of threads.

Referring again to the base of the core, its outer face is provided with a pair of opposed slots or recesses l6 and H for the reception of driving blades when these are utilized. This construction appears most clearly in Fig. 3 of the drawings from which it will also appear that the base is provided centrally with an opening l2 which communicates with and is of the same diameter as the adjacent end of the tapered bore 5 of the tubular core portion D; V

The insert or adaptor which incidentally can be cast is circular in shape and at its outer end is provided with a circumferential flange l3 which is similar in nature to the flange l of Thi flange sits in the upper bobbin head B in a manner similar to that in which the flange of the core base E is received by the lower bobbin head A. The head B is "a grooved to receive the bobbin barrel end l4 and the portion 15 or the insert is telescopically received by this end of the barrel so that the barrel end is clamped between the insert and the head." The hollow extension G of the insert is internally threaded to threadedly engage the threaded portion 8 of the 'core. A portion oi; the insert comprises a bore It in which the end 9' of the core is rotatable.

A slight modification of the invention is illustrated in Fig. 4 and the construction here illustrated is applicable to both ends of the bobbin. In this instance the openings in the bobbin heads are provided with a tapered shoulder l1 and thecore base and insert are respectively provided with a flange E8 the under-face of which is tapered to abut the taper H of the head openings. It will be understood that the flange is a substitute construction for the flanges I and 13.

The simplicity in assembling the bobbin will By tightening down the insert F on the threaded end of the core the bobbin heads and bobbin barrel are securely clamped in place. The bobbin can be taken apart with equal facility by merely removing the insert F from the core by rotation of the insert in the proper direction.

By proper machining and threading the end of the straight thickened portion 6 of the core or portion G of the adaptor these parts can be made to serve with bobbins of various lengths. When a bobbin of shorter length is desired a portion of the length of the end portion 6 of the core or portion G of the adaptor is out ofi. The necessary machinin and threading is then done. In all instances the unthreaded end 9 of the core is provided. This end serves as a pilot which gives true alignment to the parts in the assembly thereof.

Specific constructional departures can be made from the construction illustrated in the drawings without departing from the inventive concept and accordingly the invention is to be limited only within the terms of the hereinafter following claim.

WhatIclaim is:

In a bobbin, spool or the like, a barrel having a head at each end thereof, a core disposed in the barrel and provided with a longitudinally tapered bore for the reception of a tapered spindle, the core at one end being provided with an integral base adapted to secure one head to one of the barrel ends, an adaptor provided with a plate portion adapted to secure the other head to the other barrel end, the adaptor being provided with an extending tubular part disposed within the barrel and provided throughout its length with a bore, the inner end portion of the bore of said tubular part being threaded and the outer end portion of said bore being unthreaded, the unheaded end of the core having an outer end portion adapted to snugly fit the plain un i threaded outer end portion of the bore of said tubular part and having a threaded portion adapted to engage the threaded portion of said bore, the parts operating whereby the core and the adaptor can be rotated in respect to one another to clampthe heads to the barrel ends.

WILLIAM H. MILLER.

REFERENCES CITED Thev following references are of record in the file of this patent:

- UNITED STATES PATENTS 

